pub fn new_count_distinct(input_str: &str) -> usize {
    //获取逗号分隔的字符串
    let input_vec= input_str.split(",").collect::<Vec<&str>>();
    //hashset去重
    let mut hashset = std::collections::HashSet::new();
    for i in input_vec {
        hashset.insert(i);
    }
    hashset.len()
}
